The role of fluorine-substitution on the π-bridge in constructing effective thermally activated delayed fluorescence molecules

2018 ◽  
Vol 6 (20) ◽  
pp. 5536-5541 ◽  
Author(s):  
Yun Li ◽  
Jiao-Jiao Liang ◽  
Hong-Cheng Li ◽  
Lin-Song Cui ◽  
Man-Keung Fung ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Device Performance ◽  
Fluorine Substitution ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Photophysical Behavior

The fluorination on the π-bridge can obviously affect the photophysical behavior of the emitters and thus improve the device performance.

The Role of Electron–Hole Separation in Thermally Activated Delayed Fluorescence in Donor–Acceptor Blends

2015 ◽  
Vol 119 (45) ◽  
pp. 25591-25597 ◽  
Author(s):  
Eric Hontz ◽  
Wendi Chang ◽  
Daniel N. Congreve ◽  
Vladimir Bulović ◽  
Marc A. Baldo ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Electron Hole ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor

Solution processible triphenylphosphine-oxide-cored dendritic hosts featuring thermally activated delayed fluorescence for power-efficient blue electrophosphorescent devices

2019 ◽  
Vol 7 (32) ◽  
pp. 9850-9855 ◽  
Author(s):  
Mingming Zhang ◽  
Liang Chen ◽  
Xiushang Xu ◽  
Lei Zhao ◽  
Shumeng Wang ◽  
...  
Keyword(s):  
Phosphine Oxide ◽  
Triphenylphosphine Oxide ◽  
Delayed Fluorescence ◽  
Device Performance ◽  
Thermally Activated Delayed Fluorescence ◽  
Power Efficient ◽  
Thermally Activated ◽  
New Hosts

A series of phosphine oxide based dendritic hosts have been developed. Compare with conventional dendritic host H2, the new hosts not only maintain high T1 but also have a small ΔEST and bring higher device performance.

scholarly journals A Unified Framework for Photophysical Rate Calculations in TADF Molecules

2021 ◽  
Author(s):  
Leonardo Evaristo de Sousa ◽  
Piotr de Silva
Keyword(s):  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Unified Framework ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Theoretical Approaches ◽  
Singlet States ◽  
Photophysical Behavior ◽  
Theoretical Standpoint

One of the challenges in organic light emitting diodes research is finding ways to increase device efficiency by making use of the triplet excitons that are inevitably generated in the process of electroluminescence. One way to do so is by thermally activated delayed fluorescence, a process in which singlet excitons undergo up-conversion to singlet states, allowing them to relax radiatively. The discovery of this phenomenon has ensued a quest for new materials that are able to effectively take advantage of this mechanism. From a theoretical standpoint, this requires the capacity to estimate the rates of the various processes involved in the photophysics of candidate molecules, such as intersystem crossing, reverse intersystem crossing, fluorescence and phosphorescence. Here we present a method that is able to, within a single framework, compute all these rates and predict the photophysics of new molecules. We apply the method to two TADF molecules and show that results compare favorably with other theoretical approaches and experimental results. Finally, we use a kinetic model to show how the calculated rates act in concert to produce different photophysical behavior.

scholarly journals A Unified Framework for Photophysical Rate Calculations in TADF Molecules

2021 ◽  
Author(s):  
Leonardo Evaristo de Sousa ◽  
Piotr de Silva
Keyword(s):  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Unified Framework ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Theoretical Approaches ◽  
Singlet States ◽  
Photophysical Behavior ◽  
Theoretical Standpoint

One of the challenges in organic light emitting diodes research is finding ways to increase device efficiency by making use of the triplet excitons that are inevitably generated in the process of electroluminescence. One way to do so is by thermally activated delayed fluorescence, a process in which singlet excitons undergo up-conversion to singlet states, allowing them to relax radiatively. The discovery of this phenomenon has ensued a quest for new materials that are able to effectively take advantage of this mechanism. From a theoretical standpoint, this requires the capacity to estimate the rates of the various processes involved in the photophysics of candidate molecules, such as intersystem crossing, reverse intersystem crossing, fluorescence and phosphorescence. Here we present a method that is able to, within a single framework, compute all these rates and predict the photophysics of new molecules. We apply the method to two TADF molecules and show that results compare favorably with other theoretical approaches and experimental results. Finally, we use a kinetic model to show how the calculated rates act in concert to produce different photophysical behavior.

Exciton energy transfer in organic light emitting diodes with thermally activated delayed fluorescence dopants

2018 ◽  
Vol 6 (25) ◽  
pp. 6860-6868 ◽  
Author(s):  
Igor Lyskov ◽  
Mihajlo Etinski ◽  
Christel M. Marian ◽  
Salvy P. Russo
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Mutual Orientation ◽  
Exciton Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light

The role of the mutual orientation of thermally activated delayed fluorescence dopants and their complementary fluorophores in organic light emitting diodes.

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